Fan-cooled motor



J. H. PENNEY PAN- COOLED IO'IOR Se t. 14, 1948.

Filed June 8, 1 946 I INVENTOR I WITNESSES:

Pgnne James H ATTORNEY mm Sept. 14, 1948 UNITED STATES PATENT OFFICE 7 I FAN-COOLED moron James H. Penney, Bulls-lo, N. Y., asslgnor to Westinghouse Electric Corporation, East Pittsburgh, Pm, a corporation of Pennsylvania I Application June 8, 1946, Serial'No. 675,475

6 Claims. (Cl. 171-252) My invention relates to fan-cooled motors or generators. and it has particular relation to dynamo-electric machines having stator-members which are readily convertible and usable as the stator-members of protected or open machines, in a conversion-manner similar to that which is described and claimed in a copending application of Ludwig, Fockler, Formhals and Walton. Serial No. 690,628, flied August 15, 1946, and assigned to the Westinghouse Electric Corporation.

In order for a motor to be convertible from an open to an enclosed motor, or from a protected motor to a fan-cooled motor, it is highly desirable for the same stator member to be used for both types of machine, with as little conversiontrouble as possible. Since the stator member necessarily has leads, and since those leads must come out of the stator-frame whether the machine is open or closed, that is; whether it has open or closed end-brackets, it is necessary for the leads to come out of a hole or opening in the stator frame-ring, rather than through a hole in an end-bracket which would be a difierent endbracket according as the machine was open or closed at its ends.

The principal object of my invention is to provide a dynamo-electric machine having a statorconstruction which is basically utilizable as the stator of an open or protected dynamo-electric machine, and having a separate-'end-ring attachment which is secured to the end oi. the stator-core, so that it becomes essentially a part of the stator-member as distinguished from the end-brackets. This separate end-ring has a hole through which the stator-leads pass, on their way out to the hole inthe stator frame-ring. When a closed or imperforate end-bracket is brought up tightly against the end-ring attachment, and when the hole through the end-ring is plugged by a. suitable sealing-means, the ma.- chine becomes totally enclosed, ready to be fancooled by blowing air externally over the totally enclosed parts.

With the foregoing and other objects in view, my invention consists in the machines, apparatus, combinations, parts and methods hereinafter described and claimed, and illustrated in the accompanying drawing, wherein: V

Figure 1 is a longitudinal sectional view of a fan-cooled squirrel-cage induction-motor embodying my invention, the section-plane being approximately indicated by the broken line 1-1 in Fig.2, and

Fig; 2 is a transverse sectional view of the same motor.

The drawing shows a totally enclosed dynamoelectric machine comprising a strong, rigid framering 3, a stator-core member 4, a rotor-core member 5, a shaft 8, two lmperforate end-brackets I having bearings 8 supporting the shaft, and stator-leads 9. The frame-ring 3 has an accurate radial-register surface H at each end thereof. The stator-core member 4 comprises a rigidly held stack of stator-laminations I2 with an end-plate ii at each end. At a plurality of points around the periphery of the stator-core stack, the statorlamlnations and end-plates fit within the inside of the frame-ring 3, and said stator-laminations and end-plates are spaced, at other peripheral points, from the inside of the frame-ring, thus' providing axial ventilatin spaces l4, running the length of the stator-core, between portions of the outer periphery of the stator-laminations and the inside of the frame-ring. The two end-plates i3 are secured within the frame ring 3 near the respective ends thereof. The end of each endplate i3 has an accurate, continuous, axialregister surface IS.

The stator-core 4 carries a. stator-winding it, having end-turns H at each end. The statorleads 9, which may be six or more in number, extend from the end-turns I! at one end of the machine, and pass out of the machine through a hole l9 in the frame-ring 3.

In accordance with my invention, I provide 9. preferably detachable, oran easily applied, axially extending ring 2!, which abuts against the axialregister surface ii of the end-plate l3 at the end of the machine where the leads 9 leave the endturns l1, and thisring is provided with a hole 22 through which the leads pass outwardly from the end-turns, and thence on out through the hole ill in the frame-ring 3. This axially extending ring 2| is held in piaceagainst the end-plate I3, by any suitable means, which may be more or less temporary, or more or less permanent, any suitable means being utilizable, such as a clip 23 which is secured, by a screw 2!, to the end of a through-pin 25 which holds the stack of statorcore laminatlons together.

In the illustrated form of the invention, the hole 22 in the axially extending ring 2| is in the form of a notch cut in the inner end of the ring, where it abuts against the axial-register surface l5 of the end-plate I! of the stator-core 4. Each end of this axially extending ring 2| has 'a continuous axial-register surface, 26 and 21,

respectively, of a diameter corresponding to the 'axial-register surface IS on the end-plate.

For the sake of symmetry, and to use duplicate aeeasoa parts as far as possible, a second axially extending ring 28 is preferably provided at the other end of the stator-core, this second ring-extension 22 being similar to the first ring-extension 2|, except that it has no hole 22 through which leads must pass.

When two axially extending rings 2| and 28 are utilized, as shown, the two imperforate brackets I may be identical. Being imperforate, these brackets have no air-holes therein. They each have a peripheral portion having an accurate, continuous, axial-register surface 22 of a diameter corresponding to the axial-register surfaces i5, 28 and 21 of the end-plates l2 and their ring-extensions 2| and 22. The imperiorate brackets I are pressed tightly (and hence substantially air-tightly) against the accurate axial-register surfaces 21 of the axially extending rings 2| and 28, which, in turn. constitute substantially air-tight extensions of the respective ends of the stator-core, and particularly, substantially air-tight extensions of the portion of the stator-core 4 immediately surrounding the stator end-turns I1 and concentrically spaced from the inside of the frame-ring 3.

The hole 22 in the ring 2|, through which the leads 9 pass, when they first leave the end- I turns [1, is plugged by a sealing-means 2-|.

The imperforate brackets 1 preferably have no radial register with their respective end-plates l3, or with their respective ring-extensions 2| or 28, but each imperforate bracket 1 is provided with a plurality of peripheral lugs 32 having radial-register surfaces 32 having an intermittent radial register with the radial-register surface I at that end of the frame-ring 2, thus accurately centering and aligning the bearings 8, while maintaining the axial ventilating-spaces H for external air-ventilation over the stator-lamina- 28, over the imperforate brackets I, and over the 4 the stator-leads I, this hole being subsequently P u ged with a sealing-means 8|, to restore the essential air-sealing continuity all the way around the peri ery of the ring-extension II.

In the foregoing and other respects, I desire that the appended claims shall be accorded the broadest construction reasonably consistent with their language.

I claim as my invention:

1. A totally enclosed dynamo-electric machine comprising a frame-ring, an end-plate secured within the inner periphery of the frame-ring near each end of the frame-ring, a stator-core member secured between the two end-plates, at least a portion of the outer periphery of the statorcore being radially spaced from the inner periphery of the frame-ring, the end-plates having,

air-vents therein, admitting of an axial air-flow over the stator-core from one end of the core to the other, a stator-winding carried by the stator-core, said stator-winding having endturns, a plurality of leads extending from the end-turns at one end of the stator-winding, said frame-ring having a hole through which said leads pass, a shaft, a rotor-core member carried by the shaft, two imperforate brackets removably mounted on the machine, one at each end. each imperiorate bracket having no air-hole therein, and having a bearing for supporting the shaft at that end of the machine, and further having a plurality of peripheral lugs having an intermittent radial register with that end of the frame-ring, the stator-core member further comprising at least one axially extending ring, secured'to the end-plate at the end of the machine where the leads leave the end-turns, the stator-core member having a continuous axial register with each imperforate bracket, at least one of said axial registers being between said axially extending ring and the imperforate bearings 8. This external air-ventilation may be maintained by means of a fan 24 surrounding one of the brackets i, and two spaced end-hoods 35, one surrounding each bracket 1, in spaced relation thereto.

It will be apparent that my separate end-ring and lead-construction provides an attachment which is essentially a part of the stator-member of the machine, as distinguished from the removable end-brackets I and hoods and that this end-ring construction makes it possible to seal the space where the leads come out through the hole 22, thus making an enclosed machine-construction out of a stator-member which, without the ring-extensions 2| and 28,15 a statormember suitable for an open machine-ventilation.

While I have described the end-plates 13 as being machined with accurate axial-register surfaces i5 before the ring-extensions 2| and 2| are added, with the ring-extensions similarly machined, at both ends, before being placed on the machine, it is obvious that the ring-extensions could be applied first to the respective ends of the stator-core, without any previous axialregister machining, and then the axial-register surfaces 21 could be machined, for cooperating with the respective end-brackets I.

When I refer to an axial register as being continuous, I mean continuous in the sense of substantial air-tightness all the way around the machine, and I mean to include the illustrated construction in which a notch 22 is cut in the continuous axial-register surface I", for receivi g bracket at that end of the machine, said axially extending ring having a hole therein, through which said leads pass, and sealing-means for plugging the hole in said axially extending ring.

2. The invention as defined in claim 1, characterized by said axially extending ring being an attachment having a continuous axial register with the end of the end-plate at that end of the machine.

3; A totally enclosed dynamo-electric machine comprising a strong. 8 d frame-ring having an accurate radial-register surface at each end thereof, a stator-core comprising a rigidly held stack of stator-laminations with an end-plate at each end, said stack, including end-plates and stator-laminations, fitting, at a plurality of spaced points about the outer periphery of the stator-core, within the inside of the frame-ring, the end plates and stator-laminations being spaced from the inside of the framering at other peripheral points, the end of each end-plate having an accurate, continuous, axial-register surface, a stator-winding carried by the stator-laminations, said stator-winding having end-turns, a plurality of leads extending from the end-turns at one end of the stator-winding, said frame-ring having a hole through which said leads pass, two imperforate brackets removably mounted on the machine, one at each end, each imperforate bracket having no ventilating-hole therein and having no radial register with the end-plate at that end of the stator-core but having a plurality of peripheral lugs having radial-register surfaces having an intermittent radial register with the adial-register surface at that end of the frameauasoa perforate bracket and the end-plate at at least" the end of the machine where the leads leave the end-turns, means for holding said axially extending ring on the stator-core, each end of said axially extending ring having a continuous axialregister surface of a diameter corresponding to the axial-register surface on the end-plate, said axially extending ring having a hole therein, through which said leads pass, and sealing-means for plugging the hole in said axially extending ring.

4. A dynamo-electric machine comprising a frame-ring, an end-plate secured within the inner periphery of the frame-ring near each end of the frame-ring, a stator-core member secured between the two end-plates, at least a portion of the outer periphery of the stator-core being radially spaced from the inner periphery of the framering, the end-plates having air-vents therein, admitting of an axial air-flow over the statorcore from one end of the core to the other. a stator-winding carried by the stator-core, said stator-winding having end-turns, a plurality of leads extending from the end-turns at one end of the stator-winding, said frame-ring having a hole through which said leads pass. and a rotor-core member rotatable within the stator-core member,

the stator-core member further comprising at least one axially extending ring, secured to the end-plate at the end of the machine where the leads leave the end-turns. said axially extending ring having a hole therein. through which said leads pass. I

5. The invention as defined in claim 4, characterisedbysaid axiallyextendingringbeingan attachment having a continuous axial register with the end of the end-plate at that end of the machine.

6 6. A dynamo-electric machine, characterized by having a strong, rigid frame-ring, a stator-core comprising a rigidly held stack of stator-iaminations with an end-plate at each end, said stack, including end-plates and stator-laminations, ntting, at a plurality of spaced points aboutthe outer periphery of the stator-core, within the inside of the frame-ring, the end-plates and the stator-laminations being spaced from the inside of the frame-ring at other peripheral points, the end of each end-plate having an accurate,,axialregister surface, a stator-winding carried by the stator-laminations said stator-winding having end-turns, a plurality of leads extending from the end-tums at one end of the stator-winding, said frame-ring having a hole through which said leads pass, two end-brackets removably mounted on the machine, each end-bracket having a peripheral portion having an accurate axial-register surface of a diameter corresponding to the axial-register surface on the end-plate, an axially extending ring interposed between the endbracket and the end-plate at at least the end of the machine where the leads leave the end-tums, and means for holding said axially extending ring on the stator-core each end of said axially extending ring having an axial-register surface of a diameter corresponding to the axial-register surface on theend-plate. said axially extending so, ring having a hole therein, through which said leads pass.

JAMES H. PENNEY'.

naenanncas cr'rnn u The following references areof record in the file of this patent:

UNITED s'ra'ms Paras-rs l Number Name Date 1,oas,a1a Gray Feb. 10, 1914 1,858,261 Barnholt May 17, 1932 2,295,282 Lamb Sept. 8, 1942 roman PATENTS Number Country Date mnce May 18, 1931 

